Thanks for giving my game a detailed look! I agree on everything you wrote down here, I let some friends play it after it was "done" and they also told me it wasn't clear what not to hit and that it could definitely use a leaderboard.
As for the modifier, I took a bit of a shortcut there and used the impossible part in the title, as in "A perfect game? That's impossible!". Yeah, not great. I was quite time constrained unfortunately so I had to cut a lot of corners and that was one of the biggest ones.
Thanks again for giving my game a try and for your feedback. I really appreciate the time and energy you put into those to help fellow gamedevs.
Cheers!